Leary, Ian J., Schuster, B. and Yagita, N.
On universally stable elements
Quarterly Journal of Mathematics, 48, (4), . (doi:10.1093/qmath/48.4.493).
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We show that certain subrings of the cohomology of a finite p-group P may be realized as the image of the restriction map from a suitable virtually free group containing P as a subgroup. We deduce that the cohomology of P is a finitely generated module for any such subring. Examples include the ring of `universally stable elements' introduced by Evens and Priddy, and rings of invariants such as the mod-2 Dickson algebras.
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